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-rw-r--r--ext/stringio/stringio.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index dbd5a287c4..e964e79e12 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -1170,6 +1170,7 @@ strio_write(VALUE self, VALUE str)
long len, olen;
rb_encoding *enc, *enc2;
+ RB_GC_GUARD(str);
if (!RB_TYPE_P(str, T_STRING))
str = rb_obj_as_string(str);
enc = rb_enc_get(ptr->string);
@@ -1185,7 +1186,7 @@ strio_write(VALUE self, VALUE str)
ptr->pos = olen;
}
if (ptr->pos == olen) {
- rb_str_append(ptr->string, str);
+ rb_enc_str_buf_cat(ptr->string, RSTRING_PTR(str), len, enc);
}
else {
strio_extend(ptr, ptr->pos, len);
@@ -1193,7 +1194,6 @@ strio_write(VALUE self, VALUE str)
OBJ_INFECT(ptr->string, str);
}
OBJ_INFECT(ptr->string, self);
- RB_GC_GUARD(str);
ptr->pos += len;
return LONG2NUM(len);
}